feat: witness caching now operates on a bounded buffer #2413

Job	Run time
linux	13m 53s
code-quality / lints	4m 24s
licenses-audits / cargo-deny (advisories, licenses, bans, ...)	54s
link-checker / linkChecker	11s
msrv / msrv	53s
wasm / wasm-build	1m 6s
	21m 21s

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